221245213 has 16 divisors (see below), whose sum is σ = 255410176. Its totient is φ = 187732080.

The previous prime is 221245207. The next prime is 221245217. The reversal of 221245213 is 312542122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221245213 - 2¹⁷ = 221114141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221245217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422770 + ... + 423292.

It is an arithmetic number, because the mean of its divisors is an integer number (15963136).

Almost surely, 2^221245213 is an apocalyptic number.

It is an amenable number.

221245213 is a deficient number, since it is larger than the sum of its proper divisors (34164963).

221245213 is a wasteful number, since it uses less digits than its factorization.

221245213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its digits is 960, while the sum is 22.

The square root of 221245213 is about 14874.3138665284. The cubic root of 221245213 is about 604.8178884067.

Adding to 221245213 its reverse (312542122), we get a palindrome (533787335).

The spelling of 221245213 in words is "two hundred twenty-one million, two hundred forty-five thousand, two hundred thirteen".